Blacklisting random domains

[Max Kipness]

Our domains get a lot of spam from domains similar to:

@441.loopmail.com
 
I'm guessing that this company may have others including 440.loopmail,
etc. How can I remove all that include loopmail? Would it be:
 
*@*loopmail.com
 
or just *loopmail.com
 
Thanks,
Max
 
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